Jules eugene germain-



(No Model.) 2 Sheets-Sheet 1.

J. E. GERMAIN. MACHINE FOR POLISHING OPTIGAL GLASSES.

No. 550,789. Patent ed Dec. 3, 1895.

AN BREW B.GRANAM. PHOTO-LITHO WASHINGTON!) C 2 Sheets-8heet 2.

(No Model.)

J. E. GERMAIN. MACHINE FOR POLISHING OPTICAL GLASSES.

No. 550,789. Patented Dec. 3, 1895.

ANDREW B Gil/WAN FNUTO'UTNQWASNINGYOMD C.

NlTED STATES ATE T OFFICE;

JULES EUGENE GERMAIN, or PARIS, FRANCE, ASSIGNOR To LA socIErE PARISIENNE DE VERRERIE OPTIQUE, or SAME PLACE.

MACHINE FOR POLISHING OPTICAL GLASSES.

SPECIFICATION forming part of Letters Patent No. 550,789, dated December 3, 1895 Application filed April 18, 1895.

To all whom it may concern.-

Be it known that I, J ULEs EUGENE GER- MAIN, a citizen of the Republic of France, residing at Paris, in the Republic of France, have invented certain new and useful Improvements in Machines for Polishing Optical Glasses, of which the following isa specification.

This invention relates to an improved machine for acting 011 glass blanks after the same have been ground to circular form and rough-ground on their faces, so as to impart to them the required degree of transparency necessary for use. To do this work by hand required, heretofore, considerable manipulation and attention,while still leaving some inaccuracies on the faces of the optical glasses.

The object of this invention is to avoid these inconveniences and to furnish a machine by which the optical glasses can be finished by mechanical means in a superior manner.

In the accompanying drawings, Figure 1 represents a sectional side elevation of my improved machine for finishing optical glasses. Fig. 2 is a plan of the same, also partly in section. Pig. 3 is a side elevation of a portion of the machine, also partly in section and on a larger scale, so as to show more clearly the motion of the transmitting mech anism; and Fig. 4 is a horizontal section on line 4 4:, Fig. 3.

Similar letters of reference indicate corresponding parts.

The glass disks which have gone through the preparatory treatment of rough-grinding their faces are fixed,by means of pitch or other suitablecementing substance, to the exterior surfaces of a hemispherical dop A, which is attached to the lower end of a vertical shaft B. The dop A enters into a hemispherical cup C, which is supported on a shaft D. The form of the dop A and the cup 0 depends to some extent on the shape to be imparted to the faces of the glass disks, whose curvature depends on the shape of the grinding-organs and the position of the dop, which is tapered so as to produce the proper curvature on the faces of the glass disks.

The shaft 13 is provided at its upper end with loose and fast pulleys I) b, by which ro- Serial No. 546,235. (No model.)

tary motion is imparted to the shaft B. A grooved wheel E is attached to the uppermost end of the shaft B and engaged by a forked end of the pivoted lever F, so as to permit the raising of the dop A out of the cup 0. It will be readily seen that by this part of the machine the dop A is when at work subjected to a continuous rotary motion and can be lifted at will, so as to be removed from the cup 0.

The means by which the cup 0 is controlled will 110w be described. The shaft D extends into a box H, to which it is connected by means of a universal joint I. Below the boX II is mounted a wornrwheel J, which meshes with a worm K, that is placed on a horizontal shaft L L, the outer end of which is connected by means of a universal joint M with the shaft or of a conical fllCtlO11-Wh66lN. The frusto friction-wheel N is placed in contact with the second frustoconical wheel N, mounted on the shaft 0. (Shown in Fig. 2.) The shaft L L is formed of two portions, of which L is one and L the other. The portion L is connected with the other portion L by four articulated links P P P P (shown clearly in Figs. 1 and 2,) which form a kind of toggle-joint and which permit the elongation and shortening of the shaft L L, according as the links P P of the toggle-joint approach or move away from the links P P of the same. On the other hand, by reason of the universal joint M, the horizontal shaft L L can take any suitable position in regard to the shaft at of the friction-wheel N, so as to turn continuously on its axis under the influence of the friction-wheel N in following the motion of the beveled wheel N on the shaft 0.

. The worm-wheel J, which is made integral with or securely attached to the box H and which meshes with the worm K, is mounted on the upper end of a shaft Q. The worm K and the corresponding end of the shaft L L are supported firmly on the shaft Q by the interposition of the two bracket-arms K K which are secured by a ring-shaped connection K and suitable screws K" to the shaft Q, as shown in Figs. 3 and 4c. The lower end of the shaft Q is adj ustably attached to a disk R, that is supported on a shaft R, which is subjected to rotarymotion by means of fast and loose pulleys R R The disk R has a radial slot 1", which receives a set-screw 1", that enters a foot-piece 0- at the lower end of the shaft Q, whereby the latter may be ad justed on the disk. The shaft Q is not connected to the center of the disk R, but to a point on the surface of the same in such a manner that the disk R acts in the nature of an eccentric on the shaft Q.

The machine is operated as follows: After the shaft B is raised by the lever G a dop A is attached to the lower end of the shaft. On the convex surface of the dop are cemented the glass disks towhich a certain determined curvature is to be imparted. The dop is then lowered into the cup C by releasing the lever G, care being taken that between the dop and the cup is applied moist emerypowder or English polishing-powder, according as the glass disks are operated 011 for the first or second time. As soon as this is done motion is imparted to the parts in the following order: first, rotary motion to the shaft B by means of its fast pulley 1); second, to the disk R by means of the pulleys R third, to the horizontal shaft L L by means of the friction-disk N and friction-wheel N. The dop A is always rotated 011 its axis, as the movements of the other part have no influence on the same. The cup 0, however, is subjected to separate motions of rotation, one by the disk R and the other by the action of the horizontal shaft L L. It has been understood that the rotary motion of the shaft L L is transmitted to the cup C by a simple rotatory movement. If we suppose, for instance, the shaft Q is stationary, it will be obvious that by the intermediate action of the worm K on the worm-wheel G the box II and the shaft D of the cup 0 are subjected to a rotary motion on their vertical axes X Y. We have now to investigate a movement which is imparted to the cup 0 by the rotation of the disk R. This disk in turning compels the shaft Q to follow, so that it is compelled to describe the curved surface of a vertical cylinder which has for its radius the distance from the axis of the shaft S to the axis of the shaft R; but as the shaft D is not connected with the shaft Q except by a universal joint and is prevented from describing a cylinder by reason of the cup 0 at its upper end being in frictional contact with the dop A it is thereby compelled to describe the curved surface of a truncated cone. The combination of these two rotary movements, one by the shaft L L and the other by the shaft R, imparts thereby an alternating oscillating movement to the cup 0 and a'rotary movement around the axis X Y to the same, this movement around the axis X Y being in opposite direction to that in which the dop A is turned by the action of its shaft 13.

By means of the universal joint M and the toggle-joint P P P P it will be seen that the horizontal shaft L L can follow the movement of the shaft Q, while the shaft D is always rotated on its axis by means of the transmitting worm K and worm-wheel J.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a machine for polishing optical glasses, the combination of a rotary dop, a cup in which the dop rotates, a rotary shaft for supporting the cup, means for axially rotating said shaft, supporting means for the lower end of said shaft, and mechanism for moving said supporting-means in a circular path eccentrically to the axis of said shaft, whereby the latter is caused to describe the curved surface of a cone, substantially as set forth.

2. In a machine forpolishing optical glasses, the combination of a rotary dop, a cup in which the dop rotates a rotary shaft for supporting the cup, means for rotating said shaft, a rotary disk, a shaft supported eccentrically on said disk, and a universal-joint between the shaft 011 the disk and the shaft 011 the cup, substantially as set forth.

3. In a machine for polishing optical glasses, the combination of a rotary dop, a cup in which the dop rotates, a shaft for supporting the cup, a rotary disk, a shaft supported eecentrically on said disk, a worm-wheel journaled on the eccentric shaft, a box supported on the worm-wheel, a universal-j oint between the box and the shaft of the cup, and a rotary worm engaging said wormwheel, substantially as set forth.

at. In a machine for polishing optical glasses, the combination of a 'rotary dop, a cup in which the dop rotates, a shaft for supporting the cup, a rotary disk, an eccentric shaft supported on said disk, a worm-wheel journaled 011 said eccentric shaft, a box fixed to the worm-wheel, a universal-joint connecting the box with the shaft of the cup, a worm-shaft provided with a Worm for engaging said wormwheel, means for supporting said worm-shaft, and friction-wheels for rotating said wormshaft, substantially as set forth.

5. In a machine for polishing optical glasses, the combination of a rotary dop, a cup in which the dop rotates, a shaft for supporting the cup, a rotary disk, an eccentric shaft supported on said disk, a worm-wheel journaled on said eccentric shaft, a box fixed to the worm-wheel, a universal-joint connecting the box with the shaft of the cup, a sectional worm-shaft provided with a worm engaging said worm-wheel, toggle-links connecting the two portions of the sectional shaft, and means for rotating the sectional shaft, substantially as set forth.

6. In a machine for polishing optical glasses, the combination of a rotary dop, a cup in which the dop rotates, a shaft for supporting the cup, a rotary disk, an eccentric shaft arranged 011 said disk, a worm-wheel journaled on the eccentric shaft, a box fixed to the worm-wheel, a universal-j oint connecting the box with the shaft of the cup, a worm-shaft provided with a worm for engaging the wormspecification in the presence of two subscriblng Witnesses.

JULES EUGENE GERMAIN.

Witnesses:

CLYDE SHRoPsHIRE, JOSEPH LACOSTE. 

